:root {
  --bg: #18314F;
  --bg-deep: #0D0630;
  --text: #D6E3FC;
  --accent: #4C8DFF;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 640px;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

h1 {
  font-size: 1.7rem;
  margin: 0;
}

.logo {
  font-size: 2.4rem;
  letter-spacing: 2px;
  margin-top: 40px;
}

.logo span {
  display: block;
  font-size: 1.4rem;
  letter-spacing: 6px;
  opacity: 0.85;
}

.btn {
  display: inline-block;
  background: var(--bg-deep);
  color: var(--text);
  border: none;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease;
}

.btn:hover {
  background: #1a0f4a;
  transform: translateY(-1px);
}

.btn-small {
  padding: 10px 14px;
  font-size: 0.9rem;
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--text);
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.grid {
  display: grid;
  gap: 12px;
  width: 100%;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

form.grid {
  border: none;
  padding: 0;
  margin: 0;
}

.custom-form {
  display: flex;
  gap: 10px;
  width: 100%;
}

.custom-form input[type="text"] {
  flex: 1;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--text);
  background: transparent;
  color: var(--text);
  font-size: 1rem;
}

.slider-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
}

.slider-form output {
  font-size: 2.5rem;
  font-weight: 600;
  color: var(--accent);
}

.slider-form input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.chart-wrap {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 16px;
  padding: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  width: 100%;
}

.stat-card {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-card .stat-label {
  font-size: 0.85rem;
  opacity: 0.75;
}

.stat-card .stat-value {
  font-size: 2rem;
  font-weight: 600;
}

.stat-card.tempo .stat-value {
  color: #2fd08b;
}

.stat-card.fuel .stat-value {
  color: #ff6b6b;
}

.stat-card .stat-sub {
  font-size: 0.8rem;
  opacity: 0.6;
}

.subtitle {
  margin-top: -12px;
  opacity: 0.75;
  font-size: 0.95rem;
}

.empty {
  opacity: 0.7;
}

@media (max-width: 420px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }
}